mt7601u: make write with mask access atomic

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Introduce __mt7601u_rr and __mt7601u_vendor_single_wr routines in order
to make mt7601u_rmw and mt7601u_rmc atomic. This patch does not fix a
reported issue but makes the usb access more robust to concurrent
operations on the same register since it is theoretically possible that
read and write accesses of mt7601u_rmw/mt7601u_rmc can be interleaved with
a different write operation on the same register.
Moreover using __mt7601u_rr and __mt7601u_vendor_single_wr in
mt7601u_rmw/mt7601u_rmc allows to grab vendor_req_mutex mutex once
instead of twice

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Acked-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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Lorenzo Bianconi 2018-02-16 23:30:01 +01:00 • committed by Kalle Valo

parent 7972326a26

commit fee0584380

2 changed files with 39 additions and 16 deletions

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3

drivers/net/wireless/mediatek/mt7601u/mt7601u.h

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56

drivers/net/wireless/mediatek/mt7601u/usb.c

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